Abstract
BackgroundIn this study was assessed the surface roughness and chemical composition of tooth enamel and composite resin after bleaching treatment, immersion in acidic beverages, and simulated toothbrushing.Material and MethodsOne hundred and twenty dental blocks (10 x 10 x 3 mm) were randomly assigned (n = 10) according to surface treatment [none (N), bleaching (B), toothbrushing (T), and B+T] and storage medium [saliva (S), whiskey (W), and orange juice (O)]: experimental groups - N+S, N+W, N+O, B+S, B+W, B+O, S+T, W+T, O+T, B+S+T, B+W+T, and B+O+T. Two bleaching sessions were conducted using 38% hydrogen peroxide (3 applications). Surface roughness was measured using a roughness tester and composition was determined by micro energy-dispersive X-ray fluorescence spectrometry (µ-EDXRF) before and after treatments. Calcium/phosphorus (Ca/P) ratio in enamel and silica (Si) content in composite were evaluated. Data were statistically analyzed by ANOVA and Tukey’s test (α = 0.05).ResultsOverall, increased values of surface roughness for enamel and composite were observed mainly after immersion in orange juice and bleaching/toothbrushing association. Moreover, this association and immersion in whiskey resulted in lower Ca/P ratio and after aging methods, bleached and bleached/toothbrushed groups showed decreased in Ca/P ratio compared to initial values. All groups showed Si content decrease at the end, except the group without surface treatment and immersed in saliva, and bleaching followed by immersion in orange juice and toothbrushing caused the highest Si reduction.ConclusionsBleaching and toothbrushing combination strengthened the effects caused by acidic drinks on roughness and chemical composition of enamel and composite. Key words:Tooth bleaching, toothbrushing, physical properties, chemical properties.
Highlights
Smile esthetics is an important factor in individual presentation to social acceptance
The purpose in this study was to evaluate the surface roughness and change in chemical composition of tooth enamel and composite resin submitted to bleaching treatment using 38% Hydrogen peroxide (HP), immersion in low pH solutions, and/or simulated toothbrushing
In the present study, bleaching treatment effects on enamel and composite surfaces was evaluated by roughness assessment and by μ-EDXRF to analyze of calcium and phosphate content in enamel and silica content in composite
Summary
Smile esthetics is an important factor in individual presentation to social acceptance. The purpose in this study was to evaluate the surface roughness and change in chemical composition of tooth enamel and composite resin submitted to bleaching treatment using 38% HP, immersion in low pH solutions, and/or simulated toothbrushing. Specimens were randomly assigned in 12 groups (n = 10) according to surface treatment in 4 levels [none (N), bleaching (B), toothbrushing (T), and B+T] and storage medium in 3 levels [saliva (S), whiskey (W), and orange juice (O)]. All groups showed an increase in values of surface roughness for enamel and composite, except for the group without surface treatment and immersed in artificial saliva (control). All groups showed Si decrease at the end, except the control group
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